Hollow thin-wall metal part and heat-proof layer integral compression molding method based on ignition device shell assembly

Abstract

The invention discloses a hollow thin-wall metal part and heat-proof layer integral compression molding method based on an ignition device shell assembly. The forming method comprises the steps that a forming mold is designed and machined, wherein the forming mold comprises an upper mold body, a lower mold body, a mold sleeve and an internal supporting assembly; the internal supporting assemblies are installed in the hollow thin-wall metal piece in sequence; after the open end of the hollow thin-wall metal part is in threaded connection with the lower die, all the parts are placed on a flat plate press to be preheated; sleeving a die sleeve from the outer side of the hollow thin-wall metal part, mounting the die sleeve on the lower die, filling the premix, and closing the die; the whole mold is placed on a pressing machine to be cured; and demolding the cured product, and taking out the internal support assembly to obtain the hollow shell assembly coated with the heat-proof layer. According to the forming method, irreversible deformation caused by the fact that the metal piece is pressed during overall pressing forming is avoided, and the binding force between the heat-proof layer and the metal piece, the interface bonding strength and the internal quality of the heat-proof layer can be remarkably improved.

Description

Technical Field

[0001] The invention belongs to the field of functional composite materials and process technology, and in particular relates to a method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device shell component. Background Art

[0002] When an aircraft enters the atmosphere, it will have intense friction with the air, and its surface will have to withstand temperatures of thousands of degrees and the erosion of high-speed airflow. In order to protect the aircraft from burning, a layer of special heat-proof material is needed on the surface.

[0003] After receiving the ignition command, the ignition device of a general solid engine releases the safety fuse and ignites the ignition powder, generating a high-temperature and high-pressure flame to ignite the propellant in the shell, thereby starting the combustion process. The heat protection layer of the shell assembly of the ignition device is mostly made of phenolic resin-based premixes, and the products are obtained through a molding preparation process. Phenolic molded materials undergo physical and chemical changes of absorbing and dissipating heat through a series of polymer chemical reactions in a high-temperature and high-heat flow environment, protecting the internal structure of the heat protection layer to operate normally without being damaged.

[0004] At present, most products with metal parts are produced by molding the heat-proof layer separately and then bonding the heat-proof layer to the metal parts. There are many production processes, involving many process essentials, operators, and production sites, and the production efficiency is low; the metal parts and the heat-proof layer are only bonded by glue, and the shell components of the ignition device are prone to delamination and cracking of the bonding surface under high temperature conditions. Summary of the invention

[0005] In view of the problems existing in the above-mentioned background technology, the present invention provides a method for integrally compression-molding a hollow thin-walled metal part and a heat-proof layer based on an ignition device shell assembly. By integrally compression-molding the ignition device metal part and the heat-proof layer, the bonding strength between the hollow thin-walled metal part and the heat-proof layer is significantly improved, and the product has high dimensional accuracy, strong interface bonding strength, high molding efficiency and low manufacturing cost.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A method for integrally molding a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly comprises the following steps:

[0008] (1) Designing and processing a molding die, wherein the molding die includes an upper die, a lower die, a die sleeve, and an internal support assembly;

[0009] The upper mold includes a fixing plate and a molding area. The fixing plate is designed to be rectangular. The shape and size of the molding area are the same as the shape and size of the ball head of the ignition device housing assembly. The inner surface of the molding area is in line with the outer surface of the non-opening side of the ignition device housing assembly.

[0010] The lower die includes a bottom plate and a cylindrical groove provided in the middle of the bottom plate. The bottom plate is rectangular, and the cylindrical groove is used for assembling a threaded connection device;

[0011] (2) Install the internal support assembly in the hollow thin-walled metal part in sequence;

[0012] The hollow thin-walled metal part is a semi-closed metal cylinder with one end open, hollow inside, and the rest closed. The closed end is the top end and is closed by a spherical surface;

[0013] The top end of the hollow thin-walled metal part is spherical, and the tangential direction is connected to the cylindrical section;

[0014] The top end of the hollow thin-walled metal part has the same spherical shape as the ball head of the firing device housing assembly, and its diameter is smaller than the ball head diameter of the firing device housing assembly;

[0015] The internal support assembly is a combination of four metal sheets and a cylindrical core inside. The four metal sheets are obtained by cutting a complete hollow cylinder along the cylindrical surface section into four parts, and the seams between every two metal sheets are different. There is only one splicing order and splicing position for each metal sheet;

[0016] After the four metal sheets are spliced circumferentially, the inner diameter is the same as the outer diameter of the cylindrical core, the outer diameter is the same as the diameter of the cavity of the metal part, and its shape is the same as the inner cavity shape of the hollow thin-walled metal part. The metal sheets are supported by the cylindrical core so that the metal sheets can completely fit with the hollow inner wall of the hollow thin-walled metal part;

[0017] The effective height of the cylindrical core is the same as the height of the inner surface of the hollow thin-walled metal part and the height of the metal sheet. Its diameter is 1 / 2 to 3 / 4 of the inner diameter of the cylindrical surface of the hollow thin-walled metal part; the top of the cylindrical core is conformable to 1 / 2 to 3 / 4 of the circumference of the inner surface at the top of the hollow thin-walled metal part; a step is designed at the bottom of the cylindrical core and inserted into the upper groove of the threaded connection device assembled on the lower die to fix it on the lower die, and the height of the step at the bottom of the cylindrical core is the same as the height of the groove on the threaded connection device;

[0018] (3) After using threaded connection to connect the open end of the hollow thin-walled metal part with the lower die, the open end face of the metal part fits with the upper surface of the lower die. Place the lower die together with the hollow thin-walled metal part equipped with the internal support, the die sleeve and the upper die on the plate press for preheating;

[0019] A threaded connection device is assembled on the base of the lower die. The hollow thin-walled metal part is installed on the lower die through the threaded connection device, which not only fixes the metal part but also plays a positioning role;

[0020] The inner surface of the open end of the hollow thin-walled metal part has a section of internal thread, which is designed to match the external thread of the thread connection device; the side wall of the hollow thin-walled metal part is a section of cylindrical section with equal diameter, and the hollow thin-walled metal part has the characteristics of a narrow opening and a large internal cavity diameter;

[0021] (4) Put the die sleeve on the outside of the hollow thin-walled metal part and install it on the lower die. The gap left between the hollow thin-walled metal part and the die sleeve is the charging area, including the cylindrical section area and the top surface of the spherical head of the metal part; the charging area of the cylindrical section is for the forming of the cylindrical section of the product heat insulation layer. First, load the pre-mixed material that has been preheated in batches according to the weight calculated for the cylindrical section into the charging area of the cylindrical section, and then load the remaining pre-mixed material that has been preheated into the charging area of the top surface of the spherical head of the metal part inside the die sleeve, and then close the upper die;

[0022] The inner surface size of the upper die is designed based on the top spherical surface size of the hollow thin-walled metal part and the thickness of the heat insulation layer;

[0023] There is a gap left between the upper die and the top of the hollow thin-walled metal part and pre-mixed material is loaded into it;

[0024] The inner surface size and shape of the die sleeve follow the outer cylindrical surface of the heat insulation layer of the firing device housing assembly. The forming area is the cylindrical section of the product. The height of the die sleeve is 1.2 - 1.5 times the height of the cylindrical section of the product. The die sleeve and the lower die are connected and positioned through a cylindrical groove;

[0025] The installation directions of the upper die and the lower die are set to be cross-shaped, which is convenient for later demolding;

[0026] The pre-mixed material is a phenolic resin pre-mixed material, including a matrix material and a reinforcing material, and the ratio of the two is determined according to the actual product requirements; among them, the matrix material is selected from any one or more mixtures of para-aminophenol formaldehyde resin, magnesium phenol formaldehyde resin, boron phenol formaldehyde resin, barium phenol formaldehyde resin, benzoxazine resin, etc., and the reinforcing material is selected from any one or more mixtures of high-silica fiber, quartz fiber, E-glass fiber, carbon fiber, etc.;

[0027] (5) Place the entire mold in step (4) on a press and cure it according to the curing system of the product;

[0028] (6) Demold the product cured in step (5), take out the internal support assembly, and obtain a hollow thin-walled metal part coated with a heat insulation layer, which is the firing device housing assembly.

[0029] Furthermore, in step (2) of the present invention, the four-piece metal sheet is obtained by cutting a hollow cylinder into four metal sheets, and the numbers "1, 2, 3, 4" are marked on the outside of the four-piece metal sheet as the installation order, and the design markings are made from large to small.

[0030] Further, the specific operation method for installing the internal support component into the hollow thin-walled metal part in step (2) of the present invention includes: First, place the metal sheets into the cavity of the hollow thin-walled metal part in the order of "1, 2, 3, 4" marked. The metal sheets form a metal ring, the outer side of the metal sheet is closely attached to the inner wall of the cavity, and the lower surface of the metal sheet only abuts against the upper surface of the threaded connection device; Second, insert the cylindrical core into the cylindrical surface formed by splicing the metal sheets and tighten the metal sheets. The cylindrical core contacts the spherical head top of the hollow thin-walled metal part; Finally, connect the lower mold with the hollow thin-walled metal part to complete the installation of the internal support component.

[0031] Further, the hollow thin-walled metal part in step (2) of the present invention needs to be subjected to surface pretreatment before installation. The specific treatment method includes: using white corundum sand with 80-100 meshes to blast the outer surface of the hollow thin-walled metal part at a pressure of 0.4-0.6 MPa; The sandblasting time is 3-5 minutes, and the sandblasted surface has uniform particles and no metal mirror surface.

[0032] Further, the preheating temperature in step (3) of the present invention is 45-55 °C.

[0033] Further, after the loading is completed in step (4) of the present invention, the upper mold forming area is installed in the mold sleeve, placed on the press, and the mold is closed by the pressure of the press.

[0034] Further, the preheating temperature of the premixed material in step (4) of the present invention is 70 °C - 100 °C.

[0035] Further, the curing system in step (5) of the present invention is: heating to 100 °C - 120 °C under pressure and maintaining the temperature at 100 °C - 120 °C for 15 min - 30 min; then heating to 150 °C - 170 °C at a heating rate of 30 °C - 60 °C / h and maintaining the temperature for 30 - 60 min; the pressure during curing is (1 - 2) MPa.

[0036] Further, in step (6) of the present invention, the cured product is cooled to below 40 °C for product demolding.

[0037] Another aspect of the present invention provides a firing device housing assembly obtained by the above molding method.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) In the molding method of the present invention, the internal support component is used to fill the hollow part inside the metal part to support the thin-walled metal part, avoiding irreversible deformation of the metal part under pressure during overall pressing molding; By adding an internal support in the mold design, it plays a protective role for the thin-walled metal part and avoids the risk of metal part deformation;

[0040] (2) In the present invention, by installing the metal part on the mold and filling the pre-mixed heat-insulating layer material outside the metal part, and adopting the integral molding method of molding the metal part and the pre-mixed material together, compared with the way of sleeve bonding, it can significantly improve the bonding force between the heat-insulating layer and the metal part of the ignition device housing assembly, the interfacial bonding strength and the internal quality of the heat-insulating layer, and reduce the operation procedures, reduce the labor cost and improve the production efficiency;

[0041] (3) The molding method of the present invention has good application prospects and is conducive to popularization and implementation. Description of the Drawings

[0042] Figure 1 It is the overall installation schematic diagram of the molding mold described in the present invention.

[0043] Figure 2 It is the schematic diagram of the structures of the various components of the molding mold described in the present invention.

[0044] Figure 3 It is the schematic diagram of the internal support assembly in the molding mold described in the present invention.

[0045] Figure 4 It is the cross-sectional view of the four-piece metal sheet in the internal support assembly described in the present invention.

[0046] Figure 5 It is the schematic diagram of the structure of the ignition device housing assembly, the product obtained by the present invention.

[0047] Figure 6 It is the cross-sectional view of the internal structure of the combination of the molding mold and the product described in the present invention.

[0048] Each label in the figure is: 1 upper mold, 2 lower mold, 3 internal support assembly, 4 threaded connection device, 5 mold sleeve, 6 cylindrical groove, 7 metal sheet, 8 cylindrical core. Detailed Embodiments

[0049] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0050] Embodiment

[0051] A method for integral molding of a hollow thin-walled metal part and a heat-insulating layer based on an ignition device housing assembly, comprising the following steps:

[0052] (1) Design and process a molding mold, which includes an upper mold 1, a lower mold 2, a mold sleeve 5 and an internal support assembly 3;

[0053] The upper mold 1 includes a fixing plate and a forming area. The fixing plate is designed to be rectangular. The outer shape and dimensions of the forming area are the same as those of the spherical head of the firing device housing assembly, and the inner surface of the forming area is conformal with the outer surface of the non-opening side of the firing device housing assembly; the inner surface of the upper mold is conformal with the outer surface of the non-opening side of the firing device housing assembly. Specifically, the outer diameter of the upper mold is 50 mm and the total height is 35 mm.

[0054] The lower mold 2 includes a bottom plate and a cylindrical groove provided in the middle of the bottom plate. The bottom plate is rectangular, and the cylindrical groove is used to assemble a threaded connection device; the outer shape and dimensions of the lower mold 2 are the same as those of the opening of the metal part of the firing device. The length, width and thickness of the bottom plate of the lower mold are 180*140*10 mm. There is an external thread protrusion of M36 in the middle of the bottom plate, and the protrusion height is 3 mm.

[0055] The inner surface of the mold sleeve is conformal with the outer surface of the heat-insulating layer of the firing device housing assembly. Specifically, the inner diameter of the mold sleeve is 63 mm and the height is 120 mm.

[0056] (2) Surface treatment is carried out on the outer surface of the hollow thin-walled metal part. Specifically: 80-mesh white corundum sand is used to carry out sandblasting treatment on the bonding position of the metal part at a pressure of 0.6 MPa. Among them, the height of the metal part is 80 mm, the outer diameter is 40 mm, the inner diameter is 36 mm, and it is open on one side. The inner wall of the opening side is provided with a thread of M30*2 within a range of 5 mm in height along the end face inward.

[0057] The internal support parts are sequentially installed inside the hollow thin-walled metal part. The internal support assembly is a combination of four-piece metal sheets and a cylindrical core inside. Among them, the four-piece metal sheets are obtained by cutting a complete hollow cylinder along the cylindrical surface section into four parts, and the seams between every two metal sheets are different. There is only one splicing order and splicing position for each metal sheet; the inner diameter after the circumferential splicing of the four-piece metal sheets is the same as the outer diameter of the cylindrical core, the outer diameter is the same as the diameter of the cavity of the metal part, and its outer shape is the same as the inner cavity shape of the hollow thin-walled metal part. The metal sheets are supported by the cylindrical core so that the metal sheets can be completely attached to the hollow inner wall of the hollow thin-walled metal part; the effective height of the cylindrical core is the same as the height of the inner surface of the hollow thin-walled metal part, and its diameter is 1 / 2 to 3 / 4 of the diameter of the cylindrical inner surface of the hollow thin-walled metal part; the top of the cylindrical core is conformal with 1 / 2 to 3 / 4 of the circumference of the inner surface of the top of the hollow thin-walled metal part; a step is designed at the bottom of the cylindrical core and inserted into the groove inside the threaded connection device assembled on the lower mold to fix it on the lower mold. The height of the step at the bottom of the cylindrical core is the same as the height of the groove.

[0058] Specifically, the metal sheets are sequentially placed into the cavity of the metal part in the order of "1, 2, 3, 4", and the metal sheets form a metal ring; the outer side of the metal sheet is closely attached to the inner wall of the cavity, and the lower surface of the metal sheet only abuts against the upper surface of the thread; insert the cylindrical core into the inner part of the cylindrical surface formed by splicing the metal sheets, tighten the metal sheets, and the top of the cylindrical core contacts the top of the inner surface of the metal part; connect the metal part to the upper surface of the lower mold through the thread at the opening of the metal part to complete the installation of the internal support assembly; it is required that the lower surface of the metal part fits with the upper surface of the lower mold.

[0059] The hollow thin-walled metal part is a semi-closed metal cylinder with one end open, hollow inside, and the rest closed, and the closed end is the top end and is closed by a spherical surface.

[0060] The top end of the hollow thin-walled metal part is a spherical surface, and the tangential direction is connected to the column section; the wall thickness of the hollow thin-walled metal part is 2 mm.

[0061] The top end of the hollow thin-walled metal part has the same spherical shape as the ball head of the firing device housing assembly, and the diameter is smaller than the ball head diameter of the firing device housing assembly.

[0062] (3) After connecting the open end of the hollow thin-walled metal part to the lower mold with a thread, the open end face of the metal part fits with the upper surface of the lower mold. Place the lower mold together with the hollow thin-walled metal part equipped with the internal support, the mold sleeve, and the upper mold on the plate press for preheating, and the preheating temperature is 45 - 55 °C.

[0063] A thread connection device is assembled on the base of the lower mold. The hollow thin-walled metal part is installed on the lower mold through the thread connection device, which plays a role in fixing the metal part and positioning at the same time.

[0064] The inner surface of the open end of the hollow thin-walled metal part has a section of internal thread, and this internal thread is designed to match the external thread of the thread connection device; the side wall of the hollow thin-walled metal part is a section of column with an equal diameter, and the hollow thin-walled metal part has the characteristics of a narrow opening and a large internal cavity diameter.

[0065] (4) Weigh 0.24 kg of magnesium phenolic resin - high silica fiber premix and preheat it at 80 °C; put the mold sleeve on from the outside of the hollow thin-walled metal part and install it on the lower mold. The gap left between the hollow thin-walled metal part and the mold sleeve is the loading area, and this loading area is for the forming of the column section of the product heat insulation layer. First, load the preheated premix into the loading area according to the weight calculated for the column section, and then load the remaining preheated premix into the mold sleeve, and close the upper mold.

[0066] The inner surface size of the upper mold is designed based on the spherical size of the top end of the hollow thin-walled metal part and the thickness of the heat insulation layer.

[0067] There is a gap between the upper mold and the top end of the hollow thin-walled metal part, and the premix is loaded into it.

[0068] The size and shape of the inner surface of the die sleeve conform to the outer cylindrical surface of the heat insulation layer of the firing device housing assembly. The forming area is the column section of the product. The height of the die sleeve is 1.2 to 1.5 times the height of the column section of the product. The die sleeve and the lower die are connected and positioned through a cylindrical groove.

[0069] The installation directions of the upper die and the lower die are set to be cross-shaped, which is convenient for later demoulding.

[0070] (5) Place the entire mold in step (4) on a press for heat preservation, pressure holding, and curing. The curing regime is: heat up to 105 °C at a rate of 60 °C / h, and apply a pressure of 1 MPa to a single product; then heat up to 120 °C at a rate of 30 °C / h for heat preservation, and the heat preservation time is 15 min; then heat up to 150 °C at a rate of 30 °C / h for heat preservation, and the heat preservation time is 30 min.

[0071] (6) Cool the press to below 40 °C, demould the product cured in step (5), and take out the internal support assembly to obtain a hollow thin-walled metal part coated with a heat insulation layer, which is the firing device housing assembly.

[0072] Example 2

[0073] A method for integrally molding a hollow thin-walled metal part and a heat insulation layer based on a firing device housing assembly involved in this example is similar to the method described in Example 1. The same steps will not be repeated. The differences are as follows:

[0074] In step (4), weigh 0.30 kg of the phenol-formaldehyde resin - quartz fiber premix, preheat the premix at 90 °C, and then load the preheated heat insulation layer premix into the mold cavity in 4 portions, and close the upper die.

[0075] In step (5), place the entire mold on a press for heat preservation, pressure holding, and curing. The curing regime is: heat up to 110 °C at a rate of 30 °C / h, and apply a pressure of 1.5 MPa to a single product; then heat up to 120 °C at a rate of 30 °C / h for heat preservation, and the heat preservation time is 20 min; then heat up to 170 °C at a rate of 30 °C / h for heat preservation, and the heat preservation time is 60 min.

[0076] For non-destructive testing of the products in the example, it can be found that the products prepared by the above examples are not deformed; and the bonding strength between the heat insulation layer and the metal part and the interfacial bonding strength of the products are improved.

Claims

1. A method for integrally molding a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly, characterized in that: The following steps are involved: (1) Designing and processing a molding die, wherein the molding die includes an upper die, a lower die, a die sleeve, and an internal support assembly; The upper mold comprises a fixing plate and a molding area, the shape and size of the molding area are the same as the shape and size of the ball head of the ignition device housing assembly, and the inner surface of the molding area is in line with the outer surface of the non-opening side of the ignition device housing assembly; The lower die comprises a bottom plate and a cylindrical groove arranged in the middle of the bottom plate, and a threaded connection device is mounted on the cylindrical groove; (2) Install the internal support components in sequence in the hollow thin-walled metal part; The hollow thin-walled metal part is a semi-enclosed metal cylinder with one end open, the interior hollow, and the rest closed, and the other closed end is the top end and is closed with a spherical surface, the top end surface is tangentially connected to the column section, the top end has the same shape as the ball head of the ignition device housing assembly, and the diameter is smaller than the diameter of the ball head of the ignition device housing assembly; The internal support assembly is a combination of a four-petal metal sheet and an internal cylindrical core, wherein the four-petal metal sheet is obtained by cutting a complete hollow cylinder into four parts along the cylindrical surface segment, and the joints between every two metal sheets are different, and each metal sheet has only one splicing order and splicing position; The inner diameter of the four-petal metal sheet after being circumferentially spliced ​​is the same as the outer diameter of the cylindrical core, the outer diameter is the same as the diameter of the metal part cavity, and the outer shape is the same as the inner cavity shape of the hollow thin-walled metal part; The effective height of the cylindrical core is the same as the inner profile height of the hollow thin-walled metal part and the height of the metal sheet. The bottom of the cylindrical core is designed with a step, which is inserted into the groove on the threaded connection device assembled by the lower mold, and the height of the step at the bottom of the cylindrical core is consistent with the height of the groove on the threaded connection device; (3) After the open end of the hollow thin-walled metal part is connected to the lower die by using threads, the open end surface of the metal part is fitted with the upper surface of the lower die, and the lower die together with the hollow thin-walled metal part equipped with internal support parts, the die sleeve and the upper die are placed on a flat press for preheating; The inner profile of the opening end of the hollow thin-walled metal part has an internal thread, which matches the external thread design of the threaded connection device, and the side wall is a column section with equal diameter; (4) Insert the mold sleeve from the outside of the hollow thin-walled metal part and install it on the lower mold. The gap between the hollow thin-walled metal part and the mold sleeve is the loading area, including the column section area and the top surface of the metal part ball head. The column section loading area is for molding the column section of the heat-proof layer of the product. The preheated premix is ​​first loaded into the column section loading area in batches according to the calculated weight of the column section, and then the remaining preheated premix is ​​loaded into the loading area on the top surface of the metal part ball head in the mold sleeve, and the upper mold is closed; The size and shape of the inner profile of the mold sleeve are in line with the outer cylindrical surface of the heat protection layer of the ignition device housing assembly, the molding area is the product column section, and the mold sleeve and the lower mold are connected and positioned through a cylindrical groove; The inner surface size of the upper mold is designed based on the top spherical size of the hollow thin-walled metal part and the thickness of the heat protection layer; The premix is ​​a phenolic resin premix, which includes a matrix material and a reinforcing material. (5) placing the entire mold in step (4) on a press and curing according to the product curing system; (6) Demolding the product after curing in step (5), taking out the internal support assembly, and obtaining a hollow thin-walled metal part coated with a heat-proof layer, which is the ignition device shell assembly.

2. A method for integrally molding a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: The diameter of the cylindrical core in the internal support assembly in step (2) is 1 / 2 to 3 / 4 of the diameter of the inner profile of the cylindrical surface of the hollow thin-walled metal part, and the top of the cylindrical core is 1 / 2 to 3 / 4 of the circumference of the inner profile of the top of the hollow thin-walled metal part; The fixing plate of the upper die and the bottom plate of the lower die are both designed in a rectangular shape.

3. A method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: The four-petal metal sheet described in step (2) is obtained by cutting a hollow cylinder into four metal sheets, and the numbers "1, 2, 3, 4" are marked on the outside of the four-petal metal sheet as the installation order, and the design marking is carried out from large to small.

4. A method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 3, characterized in that: The specific operation method of installing the internal support assembly in step (2) into the hollow thin-walled metal part includes: First, place the metal sheets into the cavity of the hollow thin-walled metal part in the order of "1, 2, 3, 4" marked, so that the metal sheets form a metal ring, the outer side of the metal sheets is close to the inner wall of the cavity, and the lower surface of the metal sheets is only against the upper surface of the threaded connection device; Secondly, insert the cylindrical core into the cylindrical surface formed by the splicing of the metal sheets, press the metal sheets tightly, and the cylindrical core contacts the top of the ball head of the hollow thin-walled metal part; Finally, the lower mold is connected to the hollow thin-walled metal part to complete the installation of the internal support assembly.

5. A method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: The hollow thin-walled metal part in step (2) needs to be surface pretreated before installation. The specific treatment method includes: using 80-100 mesh white corundum sand to sandblast the outer surface of the hollow thin-walled metal part at a pressure of 0.4-0.6 MPa; the sandblasting time is 3-5 minutes.

6. A method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: The preheating temperature in step (3) is 45-55°C.

7. A method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: In step (4), the matrix material in the premix is ​​selected from any one of aminophenol-formaldehyde resin, magnesium phenol-formaldehyde resin, boron phenol-formaldehyde resin, barium phenol-formaldehyde resin, and benzoxazine resin, or a mixture of more than one thereof; the reinforcing material is selected from any one of high silica fiber, quartz fiber, alkali-free glass fiber, and carbon fiber, or a mixture of more than one thereof; the preheating temperature of the premix is ​​70° C. to 100° C.; The installation directions of the upper die and the lower die are arranged to be cross-shaped; The height of the mold sleeve is 1.2 to 1.5 times the height of the product column section.

8. A method for integrally pressing a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: The curing system in step (5) is: heating to 100°C to 120°C, pressurizing, and keeping at 100°C to 120°C for 15min to 30min; then heating to 150°C to 170°C at a heating rate of 30°C to 60°C / h and keeping at that temperature for 30 to 60min; The pressure during the curing is 1-2 MPa.

9. A method for integrally molding a hollow thin-walled metal part and a heat-proof layer based on an ignition device housing assembly according to claim 1, characterized in that: In step (6), the solidified product is cooled to below 40° C. and demoulded.

10. An ignition device housing assembly molded by the method according to any one of claims 1 to 9.

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